Internal energy dependence of the photodissociation dynamics of O3- using cryogenic photoelectron-photofragment coincidence spectroscopy
Abstract
Photoelectron-photofragment coincidence (PPC) spectra of ozonide, O3-, were measured at 388 nm (Ehν = 3.20 eV) using a newly constructed cryogenic octopole accumulation trap coupled to a PPC spectrometer. The photoelectron spectra reveal three processes consisting of a stable photodetachment channel, and two distinct photodissociation pathways yielding (1) O2 + O- or (2) O + O2-. The first photodissociation pathway is observed in the PPC spectra by photodetachment of the O- product by a second photon, and produces electronically excited O2(1Δg). The O2- product of the second photodissociation pathway undergoes autodetachment for O2-(2Πg, v" > 4), a process greatly enhanced by vibrational excitation of the precursor O3-. Cooling anions thermalized at 300 K to <17 K in a cryogenic octopole accumulation trap essentially turns off this autodetachment pathway. The product kinetic energy distribution in coincidence with the autodetached electrons from O2-(v′′ = 4) exhibits resolved features consistent with bend (ν2), asymmetric stretch (ν3) and a stretching combination band (ν1 + ν3) in the intermediate electronic state, illustrating the insights that can be gained from kinematically complete measurements. Finally, these results are discussed in the context of the low-lying excited states of O3-.
- Authors:
-
- Univ. of California, San Diego, CA (United States). Dept. of Chemistry and Biochemistry
- Publication Date:
- Research Org.:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1535315
- Alternate Identifier(s):
- OSTI ID: 1378813
- Grant/Contract Number:
- FG03-98ER14879
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 147; Journal Issue: 9; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; chemistry; physics
Citation Formats
Shen, Ben B., Benitez, Yanice, Lunny, Katharine G., and Continetti, Robert E. Internal energy dependence of the photodissociation dynamics of O3- using cryogenic photoelectron-photofragment coincidence spectroscopy. United States: N. p., 2017.
Web. doi:10.1063/1.4986500.
Shen, Ben B., Benitez, Yanice, Lunny, Katharine G., & Continetti, Robert E. Internal energy dependence of the photodissociation dynamics of O3- using cryogenic photoelectron-photofragment coincidence spectroscopy. United States. https://doi.org/10.1063/1.4986500
Shen, Ben B., Benitez, Yanice, Lunny, Katharine G., and Continetti, Robert E. Wed .
"Internal energy dependence of the photodissociation dynamics of O3- using cryogenic photoelectron-photofragment coincidence spectroscopy". United States. https://doi.org/10.1063/1.4986500. https://www.osti.gov/servlets/purl/1535315.
@article{osti_1535315,
title = {Internal energy dependence of the photodissociation dynamics of O3- using cryogenic photoelectron-photofragment coincidence spectroscopy},
author = {Shen, Ben B. and Benitez, Yanice and Lunny, Katharine G. and Continetti, Robert E.},
abstractNote = {Photoelectron-photofragment coincidence (PPC) spectra of ozonide, O3-, were measured at 388 nm (Ehν = 3.20 eV) using a newly constructed cryogenic octopole accumulation trap coupled to a PPC spectrometer. The photoelectron spectra reveal three processes consisting of a stable photodetachment channel, and two distinct photodissociation pathways yielding (1) O2 + O- or (2) O + O2-. The first photodissociation pathway is observed in the PPC spectra by photodetachment of the O- product by a second photon, and produces electronically excited O2(1Δg). The O2- product of the second photodissociation pathway undergoes autodetachment for O2-(2Πg, v" > 4), a process greatly enhanced by vibrational excitation of the precursor O3-. Cooling anions thermalized at 300 K to <17 K in a cryogenic octopole accumulation trap essentially turns off this autodetachment pathway. The product kinetic energy distribution in coincidence with the autodetached electrons from O2-(v′′ = 4) exhibits resolved features consistent with bend (ν2), asymmetric stretch (ν3) and a stretching combination band (ν1 + ν3) in the intermediate electronic state, illustrating the insights that can be gained from kinematically complete measurements. Finally, these results are discussed in the context of the low-lying excited states of O3-.},
doi = {10.1063/1.4986500},
journal = {Journal of Chemical Physics},
number = 9,
volume = 147,
place = {United States},
year = {Wed Sep 06 00:00:00 EDT 2017},
month = {Wed Sep 06 00:00:00 EDT 2017}
}
Web of Science
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